linux-kernel - Re: [PATCH] block: aoe: handle device timeouts atomic-safe

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Date:   Thu, 10 Mar 2022 07:29:44 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Valentin Kleibel <valentin@...is.at>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Justin Sanders <justin@...aid.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH] block: aoe: handle device timeouts atomic-safe

On Thu, Mar 10, 2022 at 04:17:37PM +0100, Valentin Kleibel wrote:
> If an aoe device does not respond to any packet on the network layer within
> aoe_deadsecs, the driver tries to mark the device as down, fail all I/O and
> clean out the queue.

I think the problem is that aoe even tries to queue up request
internally. It really needs to switch to use BLK_MQ_F_BLOCKING and
stop queuing up the requests internall at all.